fun <T> List<T>.chunks(n: Int): List<List<T>> = chunks(n) { it.toList() }
inline fun <T, R> List<T>.chunks(n: Int, transform: (List<T>) -> R): List<R> {
    require(n >= 1)
    return buildList {
        var offset = 0
        var remaining = this@chunks.size
        for (i in n - 1 downTo 0) {
            val size = (remaining + i) / (i + 1)
            add(transform(this@chunks.subList(offset, offset + size)))
            offset += size
            remaining -= size
        }
    }
}